Control-rod mechanism, particularly for use in change-speed gears change clutches, and so on, of motor vehicles and the like



E IN CHANGE SPEED GEARS. EHICLES AND THE LIKE Aug. 1l, 1925. v K. MAYBACH CONTROL ROD MECHANILSM, PARTICULARLY FCR US CHANGE CLUTCHES, AND SO ON 'OF MOTOR 'V Filed Sept'. 5, 1924 Patented Aug. 11, 1925..

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KARL MAYBACH, or FRIEnRrcHsr-Iernu, GERMANY, .Assrenon To 'MAYBACH Moron- ENBAU ensntnscnesr r/rlrrEsCHRANKTE-a HAFTUNG, or rm::Ennrorrsnarnny GERMANY.

CONTROL-ROD MECHANISM, l?ARTI(TULARLVSLr FDR USE IN CHANGE-SPEED GEARS, CHANGE CLUTCHES, .AND S0' 0N, OF MOTOR VEHICLES AND TI-lllily LIKE.

Applioationled September 5, 1924. Serial No. 736,196.

To all whom t may concern.'

Be it known that I, KARL MAYnAcI-r, citizen of the German Republic, residing at Friedrichshafen, Bodensee, Germany, have invented certain new and useful Improvements in Control-Rod Mechanism, Particularly for Use in Change-Speed Gears, Change Clutches, and so on, of Motor Vehicles and the like, for which the following is a speci.- ication. Y l

The subject of the present invention is a control rod mechanism` particularly 'for use in change speed gears, change clutches and so on `of motor-vehicles and the like, in which the control rod according to the velocity, with which it is moved from the one end position tothe other, is held fast and bolted vup automatically in anfintermediate position or may freely arrive 4at the other end position.- l Y 1 This object may be secured, in`such a manner, that f. `i. at a slow movement of the l control rod frornone end 'position to the other the control rod is held tast by the aid of a locking device in anintermediate position, while at a rapid movement of the control rod lthe locking device remains inoperative.'

For this purpose according'tothe invention a locking device may be employerhin Rvh'icli the bolt cannot become operative on accountoi the inertia 4of itsmass, it the control rod ismoved rapidly or is 'connected with a hydraulic brake' piston.'l ,i 35, The-bolt in connectionvvith its notch` are shaped in such a manner. that, the notch only `in one 'direction is acting in a locking manner, while :inthel otherdir'ection it yis j l The-invention willbe best .understood by preference to thel accompanying drawings, wherein: i

, not acted upon by the bolt, and` that ythe 'bolt possesses `afcertain dead way of` incidence with respect to the notch, during whicha locking of the notch does not occur. For securing a reliable engagementl of the bolt with the notch, the operation of the hydraulic brake piston is4 preferably compensated totally or partially during the last portion of its stroke.

This result may be obtained f. i. by arranging the `hydraulic brake piston in a cylinder, having on the last portion of 'the piston stroke an enlargemenufso that the piston rexerts atfirst an'intense `braking ef-4 feet upon the bolt, but after having reached the enlargement Vmakes a rapid movement,

favored by the action of aspring, for enabling the bolt torengage with the notch.

The device according to the present invention may be employed 'for all kinds'of control rods, as f. i. for gears, clutches and so on. Especially advantageous is the vinvention for the control ofpchange clutches of motor vehicles, because it permits, to produce a free runv position, which may be 'controlledby foot-levers, for enabling theautomobilist to use his hands'only'for the@ steering of` the vehicle. In this rcase only one movement in theforward direction by exerting a vpressurev isVV at vdisposition as controlling movement, and the, control lever is moved back in its primary position'by theaction offa spring when beingfreleased. In this casekthe invention permits in the simplest manner, to produce a freeV run position, capable of being locked,by arranging such aV gear mechanism with twogspeeds,v controlled by afoot lever, they endpositions of fwhich correspond tothe direct drive and to a lowerspeed, insuch a mannenthat the foot lever, after having been vpressed down f., i.'

tofthe .lower speed, returns to the lother end 4posit-ion if 'being rapidlyreleased, Qwhi'le it Will belocked bythe bolt in an intermediate position correspondingto the ruiming plight, oftheinotor, if'the floot'` lever isslowly released. i

. Fig.. l-shows the locking device in a longitudinal section in that position,-in which by pressing down the foot lever the lower A-A of Fig. e and Fig.'v 4 shows -thenotch ona larger scale. l The foot lever 2 rotatably arranged on the axis 1, is connected with the rodi-3 of a piston 4, which is movable in a cylinder 5 against the. action of a spring 6. The piston rod 3 is provided with a notch 7, the locking edge of which is provided with a bevelment 7 beginning approximately from the middle ,of its depth, so that it can act ina locking manner only in its lower part. This notch is arranged in the reach of a bolt 8, which is acted upon by a spring 9 and car-ries av brake piston 10, which moves during a'certain part of its stroke in the cylindrical portion 11 Vof la case, forming an oil tank with the cylinder 5, while it moves during its Jfurther stroke in an enlargement 12 of the'cylindrical portion 11. By the bevelment 7 a certain dead way of incidence is given to the bolt 8 with respect tothe notch 7.

The operation ot the device is the followinv:

lthe .toot lever 2 is in the position shown in Fig.V 1, that means, if it is totally pressed down and t. i. the lower speed is put in, the bolt 8 rests upon the piston rod 3 before the notch 7, and the piston 10 is in the narrower portion of the `cylinder .11. The springs 6 and 9 are put under tension. If now the foot-lever is released, the spring 9 Vtends to move downwards the bolt 8. This tendency of the spring 9 is, however, opposed by the brake piston 10, by retarding `at rst Athe movement of the bolt 8, until it `arrives at the enlarged portion 12 of the cylinder. In this moment the spring 9 is able to shoot suddenly the bolt 8 when the notch 7 arrives below the bolt 8 by releasing` slowly the foot lever 2 as the piston 10 .doesnot find any resistance, because the oil may fflow without ado above the piston. The

r,piston rod is 'therefore bolted in the position shown in Fig. 2, .if ythe :toot lever is slowly released.

It, however, the foot lever is .rapidly released, the notch 7, owing to the retarded movement of the bolt 8, slides freely below the latter (Fig. et) yor the bolt 8 strikes upon the bevelment 7 Eof the notch, so .that the foot lever is lable to return to the position, shown by `dotted, lines lin 1, in which the direct drive is put in. y

From the locked position (Fig, Y2,),r the Jtoot lever 2 can vreturnto the rest. position only, after having" been' brought into the position of Fig. 1, because the notch does .notact in a locking manner in this direction .of lmovement `s o that itis not possible, to put in the direct drive from `the' free run position.

What I claim is:

1. In control rod mechanism, particularly for use in `change speed gears, change clutches and so on of motor vehicles and Ithe like the combination of a control lever, Vthe lend positions of which correspond to, ytwo speeds (f. tothe direct drive and to a lower i stpe ed,) a rod7 connected with said control lever, means ,for pressing said rod together with said lever into one end position, a notch in said rod, a locking device and means for causing said locking device to co-operate with said notch andV lock the saidv rod in an intermediate position or not, according as the control lever is released slowly or rapidly.

2. In control rod mechanism, the .coinbination ot a control lever, the end positions ot which correspond to two speeds (t. i. to the direct drive and to a lower speed), a rod, connected with said control lever, means for pressing said, rod together with said lever into one end position, a notch in said rod, a locking device, means for causing said locking device to co-operate with said notch and lock the said rod in an intermediate position or not, a bra-ke cylinder, and a brake pistcii therein. connected with said locking device, and designed to retard the move ment of said locking device.

3. In control rod mechanism, the combination off a control lever, the end positions ot' which correspond to'two speeds (t. i. to the direct drive and to a lower speed, a rod, connected with said control lever, means for pressing fsaid rod together with said ylevier into one end position, a notch in said rod, a locking device, means for causing said locking device to cooperate with said notch and lock the said rod in an intermediate position or not, a brake cylinder, an enlargement inthe diameter of said cylinder and a brake piston `connected with said locking device and movable in said cylinder in such manner, that it `retards the vmovement of ,the locking device on the first part of its stroke, but after reaching the said enlargement, admits an accelerated movement of the locking device for engaging the same with said notch.

4i. In control rod mechanism, thc,combination of a control lever, the end positions of which correspond to Atwo speeds (t. i. to `the direct drive and'to a lower speed), a rod, connected with said control lever, means for ,pressing said rod together with said lever vinto one end position, a notch in said rod,

acting only in one direction in a locking manner, a locking device, means for causing said locking device to cooperate with said` notch and lock the said rod in an interina diate position o r not, va brake cylinder, an enlargement in the diameter ot said cylinder and a brake piston connected with said ,locking device and movable ,in said cylinder in such a manner, that it retards the movement of the locking device on the lfirst vpart ot its stroke, but ,after reaching the said enlargement, admits an accelerated movement of the locking device for engaging the .same with `said notch. i

5. In control rod mechanism, the combinationfot a control lever, theend positions .of

which correspond to two speeds (i. i. to the direct drive and to a lower speed) a rod, connected with said control lever, means :tor pressing said rod together with said lever into one end position, a notch in said rod, acting only in one direction in alocking manner, a bevelment extending approxi mately from the middle of the locking edge of the notch a locking device, means for cansing said locking'device to cooperate with said notch and lock the said rod in an inter,- mediate position or not, a brake cylinder, an enlargement in the diameter of said cylinder and, a bra-lie piston connected with said locking device and movable in said cylinder in such a manner, that it retards the movement of the locking device on the first part of its stroke, but'aifter reaching the said enlargement, admits an accelerated movement of the locking device for engaging the same with said notch.

6. In control rod mechanism, the combination of a control lever, the position of rest of which corresponds to the direct drive and its end position corresponds to the lower speed drive and its intermediate position corresponds to the running light of the motor, a piston rod, connected with said control lever, a spring, pressing said piston rod together with said control lever into one end position, a notch in said rod, having a beveled locking edge, a locking bolt, a spring causing said bolt to cooperate with said notch and lock the said rod in an intermediate position or not, according as the control lever is released slowly or rapidly, a brake cylinder filled with a'liquid, an enlargement in the diameter ,of said cylinder, and a brake piston, connected with said locking bolt and movable in said cylinder in such a manner that it retards the movement of the locking bolt on the lirst part of its stroke, but after reaching the said enlargement admits an accelerated movement oi' the locking bolt for engaging the same with the notch.

KARL MAYBAGH. 

